<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			
			
			// 1. 数组
			var arr1 = new Array();
			console.log(arr1.length)
			
			arr1[0] = "张三";
			arr1[1] = 1;
			arr1[2] = "王五"
			console.log(arr1)
			console.log(arr1.length)
			
			var arr2 = new Array(3);
			console.log(arr2[0])
			
			var arr3 = new Array(10,20,30,40,50)
			console.log(arr3[0])
			
			var arr4 = [10,20,30,40]
			console.log(arr4)
			
			var arr5 = [
				[1,2,3],
				[4,5,6],
				[7,8,9],
			];
			var stus = [
				{id:1,name:"张三",age:18},
				{id:2,name:"李四",age:19},
				{id:3,name:"王五",age:20},				
			]
			console.log(stus)
			
			
			
			
		</script>
	</body>
</html>